# Copyright 2013-2015 MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Test Motor, an asynchronous driver for MongoDB and Tornado."""
import asyncio
import os
import test
import unittest
from abc import ABC
from multiprocessing import Pipe
from test.tornado_tests import MotorTest
from test.utils import ignore_deprecations

import pymongo
from pymongo import WriteConcern
from pymongo.read_preferences import Nearest, ReadPreference, Secondary
from tornado.ioloop import IOLoop
from tornado.testing import gen_test

import motor


class MotorTestBasic(MotorTest):
    def test_repr(self):
        self.assertTrue(repr(self.cx).startswith("MotorClient"))
        self.assertTrue(repr(self.db).startswith("MotorDatabase"))
        self.assertTrue(repr(self.collection).startswith("MotorCollection"))
        cursor = self.collection.find()
        self.assertTrue(repr(cursor).startswith("MotorCursor"))

    @gen_test
    async def test_write_concern(self):
        # Default empty dict means "w=1"
        self.assertEqual(WriteConcern(), self.cx.write_concern)

        await self.collection.delete_many({})
        await self.collection.insert_one({"_id": 0})

        for wc_opts in [
            {},
            {"w": 0},
            {"w": 1},
            {"wTimeoutMS": 1000},
        ]:
            cx = self.motor_client(test.env.uri, **wc_opts)
            wtimeout = wc_opts.pop("wTimeoutMS", None)
            if wtimeout:
                wc_opts["wtimeout"] = wtimeout
            wc = WriteConcern(**wc_opts)
            self.assertEqual(wc, cx.write_concern)

            db = cx.motor_test
            self.assertEqual(wc, db.write_concern)

            collection = db.test_collection
            self.assertEqual(wc, collection.write_concern)

            if wc.acknowledged:
                with self.assertRaises(pymongo.errors.DuplicateKeyError):
                    await collection.insert_one({"_id": 0})
            else:
                await collection.insert_one({"_id": 0})  # No error

            # No error
            c = collection.with_options(write_concern=WriteConcern(w=0))
            await c.insert_one({"_id": 0})
            cx.close()

    @ignore_deprecations
    def test_read_preference(self):
        # Check the default
        cx = motor.MotorClient(test.env.uri, io_loop=self.io_loop)
        self.assertEqual(ReadPreference.PRIMARY, cx.read_preference)

        # We can set mode, tags, and latency.
        cx = self.motor_client(
            read_preference=Secondary(tag_sets=[{"foo": "bar"}]), localThresholdMS=42
        )

        self.assertEqual(ReadPreference.SECONDARY.mode, cx.read_preference.mode)
        self.assertEqual([{"foo": "bar"}], cx.read_preference.tag_sets)
        self.assertEqual(42, cx.options.local_threshold_ms)

        # Make a MotorCursor and get its PyMongo Cursor
        collection = cx.motor_test.test_collection.with_options(
            read_preference=Nearest(tag_sets=[{"yay": "jesse"}])
        )

        motor_cursor = collection.find()
        cursor = motor_cursor.delegate

        self.assertEqual(Nearest(tag_sets=[{"yay": "jesse"}]), cursor._get_read_preference())

        cx.close()

    def test_underscore(self):
        self.assertIsInstance(self.cx["_db"], motor.MotorDatabase)
        self.assertIsInstance(self.db["_collection"], motor.MotorCollection)
        self.assertIsInstance(self.collection["_collection"], motor.MotorCollection)

        with self.assertRaises(AttributeError):
            self.cx._db

        with self.assertRaises(AttributeError):
            self.db._collection

        with self.assertRaises(AttributeError):
            self.collection._collection

    def test_abc(self):
        class C(ABC):
            db = self.db
            collection = self.collection
            subcollection = self.collection.subcollection

        # MOTOR-104, TypeError: Can't instantiate abstract class C with abstract
        # methods collection, db, subcollection.
        C()

    @gen_test
    async def test_inheritance(self):
        class CollectionSubclass(motor.MotorCollection):
            pass

        class DatabaseSubclass(motor.MotorDatabase):
            def __getitem__(self, name):
                return CollectionSubclass(self, name)

        class ClientSubclass(motor.MotorClient):
            def __getitem__(self, name):
                return DatabaseSubclass(self, name)

        cx = ClientSubclass(test.env.uri, **self.get_client_kwargs())
        self.assertIsInstance(cx, ClientSubclass)

        db = cx["testdb"]
        self.assertIsInstance(db, DatabaseSubclass)

        coll = db["testcoll"]
        self.assertIsInstance(coll, CollectionSubclass)
        self.assertIsNotNone(await coll.insert_one({}))


class ExecutorForkTest(MotorTest):
    @unittest.skipUnless(hasattr(os, "fork"), "This test requires fork")
    @gen_test()
    async def test_executor_reset(self):
        parent_conn, child_conn = Pipe()
        lock_pid = os.fork()
        if lock_pid == 0:  # Child
            asyncio.set_event_loop(asyncio.new_event_loop())
            self.loop = IOLoop.current()
            client = self.motor_client()
            try:
                self.loop.spawn_callback(client.db.command, "ping")
            except Exception:
                child_conn.send(False)
            child_conn.send(True)
            os._exit(0)
        else:  # Parent
            self.assertTrue(parent_conn.recv(), "Child process did not complete.")
